linux-kernel - Re: [PATCH 1/2] sched/fair: Filter out locally-unsolvable misfit imbalances

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Message-ID: <87czuqkxjt.mognet@arm.com>
Date:   Mon, 19 Apr 2021 18:13:10 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Qais Yousef <qais.yousef@....com>,
        Quentin Perret <qperret@...gle.com>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        Rik van Riel <riel@...riel.com>,
        Lingutla Chandrasekhar <clingutla@...eaurora.org>
Subject: Re: [PATCH 1/2] sched/fair: Filter out locally-unsolvable misfit imbalances

On 16/04/21 15:29, Vincent Guittot wrote:
> On Thu, 15 Apr 2021 at 19:58, Valentin Schneider
> <valentin.schneider@....com> wrote:
>> @@ -9441,8 +9465,8 @@ static struct rq *find_busiest_queue(struct lb_env *env,
>>                  * average load.
>>                  */
>>                 if (env->sd->flags & SD_ASYM_CPUCAPACITY &&
>> -                   !capacity_greater(capacity_of(env->dst_cpu), capacity) &&
>> -                   nr_running == 1)
>> +                   env->src_grp_type <= group_fully_busy &&
>> +                   !capacity_greater(capacity_of(env->dst_cpu), capacity))
>>                         continue;
>>
>>                 switch (env->migration_type) {
>> @@ -9504,15 +9528,18 @@ static struct rq *find_busiest_queue(struct lb_env *env,
>>                 case migrate_misfit:
>>                         /*
>>                          * For ASYM_CPUCAPACITY domains with misfit tasks we
>> -                        * simply seek the "biggest" misfit task.
>> +                        * simply seek the "biggest" misfit task we can
>> +                        * accommodate.
>>                          */
>> +                       if (!cpu_capacity_greater(env->dst_cpu, i))
>
> Use the same level of interface as above. This makes code and the
> condition easier to follow in find_busiest_queue()
>
> capacity_greater(capacity_of(env->dst_cpu), capacity_of(i))
>

OK